why is there a glass case around the bulb

Dear student

It is protected from the glass bulb because it is filled with inert gases like argon ,neon to protect the filament of the bulb  from getting oxidezed.Regards

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he filament sits in the middle of the bulb, held up by a glass mount. The wires and the filament are housed in a glass bulb, which is filled with an inert gas, such as argon.
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it helps to stop the inert gases from mixing with air
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